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Data Set ID:

Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole, Version 1

This data set includes d15N, d18O/2, dO2/N2/4, d40Ar/4, d38/Ar/2,
d84Kr/48, and d132Xe/96 values for air drawn from the top 15 to 50 m
of firn at the South Pole (summer and winter 1998) and a site at Siple
Dome (summers 1996 and 1998). Data also include related firn
temperature measurements.

The objective of this research was to better understand thermal
fractionation processes affecting records of atmospheric history from
firn and ice core gases. Recent work (e.g., Severinghaus and Brook,
1999) has exploited trapped air in ice and deep firn as a record of
past atmospheric composition and climate change. Interpretation of these paleoclimate archives is complicated by artifacts of thermal
diffusion, a process in which heavier gases migrate down temperature
gradients toward colder regions in the firn. Seasonal temperature
change at the snow surface creates strong temperature gradients in the
top few meters of the firn, which cause isotopic fractionation of firn
gases. A specific goal of this research is to identify any long-term
effects of seasonal temperature fluctuations on firn air isotopic

Geographic Coverage

Spatial Coverage:
  • N: -89.997, S: -89.997, E: -102, W: -102

  • N: -81.667, S: -81.667, E: -148.767, W: -148.767

Spatial Resolution: Not Specified
Temporal Coverage:
  • 14 January 1998 to 28 July 1998
Temporal Resolution: Not specified
  • Ice Core Records > Ice Core Air Bubbles > Firn Air
  • Glaciers/Ice Sheets > Ice Sheets > Firn Air Isotopes
  • Ice Core Records > Isotopes > Firn Air Isotopes
  • Snow/Ice > Snow/Ice Temperature > Firn Temperature
Data Format(s):
  • Microsoft Excel
  • ASCII Text
Version: V1
Data Contributor(s): Jeffrey Severinghaus, A. Grachev, Mark Battle

Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Severinghaus, J. P., A. Grachev, and M. Battle. 2001. Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: [Date Accessed].
No technical references available for this data set.